linux-kernel - Re: [PATCH V3] dt-bindings: dma: fsl-edma: Convert to DT schema

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Date:   Sun, 29 May 2022 16:17:51 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, vkoul@...nel.org,
        dmaengine@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, joy.zou@....com,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3] dt-bindings: dma: fsl-edma: Convert to DT schema

On 27/05/2022 04:05, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Convert the eDMA controller binding to DT schema.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> 
> V3:
>   Address Krzysztof's comments, for reg/interrupts/clock-names
> 
> V2:
>   Typo fix
>   Correct interrupts/interrupt-names/AllOf
> 
> 
>  .../devicetree/bindings/dma/fsl,edma.yaml     | 155 ++++++++++++++++++
>  .../devicetree/bindings/dma/fsl-edma.txt      | 111 -------------
>  arch/arm64/boot/dts/freescale/imx93.dtsi      |   2 +-
>  3 files changed, 156 insertions(+), 112 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/dma/fsl,edma.yaml
>  delete mode 100644 Documentation/devicetree/bindings/dma/fsl-edma.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/fsl,edma.yaml b/Documentation/devicetree/bindings/dma/fsl,edma.yaml
> new file mode 100644
> index 000000000000..050e6cd57727
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/fsl,edma.yaml
> @@ -0,0 +1,155 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/fsl,edma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale enhanced Direct Memory Access(eDMA) Controller
> +
> +description: |
> +  The eDMA channels have multiplex capability by programmable
> +  memory-mapped registers. channels are split into two groups, called
> +  DMAMUX0 and DMAMUX1, specific DMA request source can only be multiplexed
> +  by any channel of certain group, DMAMUX0 or DMAMUX1, but not both.
> +
> +maintainers:
> +  - Peng Fan <peng.fan@....com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - fsl,vf610-edma
> +          - fsl,imx7ulp-edma
> +      - items:
> +          - const: fsl,ls1028a-edma
> +          - const: fsl,vf610-edma
> +
> +  reg:
> +    minItems: 2
> +    maxItems: 3
> +
> +  interrupts:
> +    minItems: 2
> +    maxItems: 17
> +
> +  interrupt-names:
> +    minItems: 2
> +    maxItems: 17
> +
> +  "#dma-cells":
> +    const: 2
> +
> +  dma-channels:
> +    const: 32
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    maxItems: 2
> +
> +  big-endian:
> +    description: |
> +      If present registers and hardware scatter/gather descriptors of the
> +      eDMA are implemented in big endian mode, otherwise in little mode.
> +    type: boolean
> +
> +required:
> +  - "#dma-cells"
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - dma-channels
> +
> +allOf:
> +  - $ref: "dma-controller.yaml#"
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: fsl,vf610-edma
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: dmamux0
> +            - const: dmamux1
> +        interrupts:
> +          maxItems: 2
> +        interrupt-names:
> +          items:
> +            - const: edma-tx
> +            - const: edma-err
> +        reg:
> +          maxItems: 3
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: fsl,imx7ulp-edma
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: dma
> +            - const: dmamux0
> +        interrupts:
> +          maxItems: 17

Looks good, although the information about order of interrupts is lost
during conversion. The original bindings had:
"total 16 channel interrupt and 1 error interrupt(located in the last)"

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


Best regards,
Krzysztof